TweetFollow Us on Twitter

Separate Data, Code
Volume 8
Number4
Column Title:Getting Started

Related Info: Resource Manager Window Manager Picture Utilities

Separating Data from Code

Using those little pockets of data called resources

By Dave Mark, MacTutor Regular Contributing Author

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

Last month’s column focused on QuickDraw, the Macintosh drawing environment. The TextBoxer program showed you how to use QuickDraw in combination with the Window Manager to draw text and graphics in a window. This month we’ll learn about resources, the Mac’s mechanism for separating data from code.

Resources

Resources are little pockets of data, designed to pull descriptive data out of your program’s source code. For example, a WIND resource describes the size, location, and characteristics of a Macintosh window. In last month’s column, we used the Window Manager call NewWindow() to create a new window:

/* 1 */

WindowPtr window;
Rect    windowRect;
 
SetRect( &windowRect, 20, 40, 260, 74 );

window = NewWindow( nil, &windowRect, "\pBox o’ Text",
 kVisible, documentProc, kMoveToFront,
 kNoGoAway, kNilRefCon );

The parameters passed to NewWindow() completely describe the window. The trouble is, the description is inexorably bound into the source code. To change the size or position of the window, you’ve got to recompile your program. The WIND resource gives you an alternative to this strategy. Here’s how it works...

Basic Resource Strategy

At the heart of any resource strategy is a resource editor. Though there are others, for my money [especially since it is free - Ed.] ResEdit can’t be beat. ResEdit allows you to edit resources using a graphic resource editor designed for that resource type. For example, Figure 1 shows ResEdit’s WIND editing window.

This window gives you all the tools you’ll need to completely describe a window. At the top is a row of icons that let you select the type of window you’d like to create. At bottom-left is a series of fields you can use to describe the size and location of the window. In the center is a miniature version of your screen, showing how your window will look once it’s created.

Figure 1. ResEdit’s WIND editing window.

Once you design your resources, you load them into your program using a set of Toolbox routines designed to work with resources. As an example, the routine GetNewWindow() loads a WIND resource and creates the same kind of WindowRecord as the Window Manager routine NewWindow():

/* 2 */

window = GetNewWindow( kBaseResID, nil, kMoveToFront );

If you use NewWindow() to create a window, the data that describes the window is embedded in the source code in the form of NewWindow() parameters. If you use GetNewWindow(), the data that describes the window resides outside of your program’s code, in the WIND resource. The WIND resource acts as a template for creating a window.

As you spend more time programming the Macintosh, you’ll learn more and more about the enormous potential of resources. For now, we’ll start slowly, introducing a few basic resources in this column, and adding to our list each month.

Resource Management Specifics

Resources are identified by a resource type and a resource ID. The resource type is a four-byte value, typically made up of readable ASCII characters. The resource type defines the data described by the resource. For example, a WIND resource always follows the same format and always describes a Macintosh window. There are lots of different resource types.

A program can contain more than one resource of a given type. The resource ID serves to differentiate one resource of a given type from another. Typically, resource IDs start at 128 and move upwards from there. If your program used three WIND resources, you’d number them 128, 129, and 130.

This month’s sample program, PICTWindow, makes use of two resources, a PICT and a WIND. The PICT resource contains a Macintosh picture. PICTWindow uses the WIND resource to create a new window, loads the PICT resource into memory, then draws the PICT in the window.

Let’s get to work...

Creating the PICTWindow Resources

If you don’t already have a copy of ResEdit, go out and get one. You can download ResEdit from most of the big bulletin boards, and you can purchase ResEdit from APDA.

In my latest APDA catalog, there were three entries for ResEdit version 2.1.1. $29.95 gets you the manual and disk, $14.95 is the manual only, and $15.00 for the disk only. You can reach APDA by phone at (800) 282-2732 in the United States, (800) 637-0029 in Canada, and (408) 562-3910 internationally.

You might also consider ordering the book ResEdit Complete, a fine book written by Peter Alley and Carolyn Strange ($29.95 from APDA).

Once you’ve copied your copy of ResEdit to your hard drive, create a folder for all the PICTWindow files inside your development folder. I called my folder (logically enough) PICTWindow.

Next, use your favorite graphics package to create a pleasing picture. Copy the picture, then paste it into the Scrapbook. Feel free to use color, text, and whatever else pleases your eye in your picture. PICTWindow can handle anything you can paste into the Scrapbook.

Now you’re ready to create some resources. Double-click on the ResEdit icon to start-up ResEdit. When the bouncing Jack-in-the-box appears, click the mouse button. You’ll be prompted for a file to open (if your version of ResEdit doesn’t prompt you, it’s OK, just ignore the rest of this paragraph). Click the Cancel button.

We’re going to create a new resource file. Select New... from the File menu. The dialog box shown in Figure 2 will appear, asking you to name the new resource file. Using the standard techniques, navigate over and in to the PICTWindow folder you created earlier. In the text field at the bottom of the dialog box, type the file name PICTWindow.Π.rsrc exactly as it appears in Figure 2. To type the Π character, hold down the option key and press the p key. Be sure to type the name exactly as shown. Don’t add anything. Don’t leave anything out. You’ll see why later in the column.

Figure 2. Naming your new resource file.

Once the name is typed in, click on the New button. ResEdit will create the new resource file and display a window showing the resources in this file. So far, there are none. We’ll fix that right now.

Select Create New Resource from the Resource menu. A scrolling list of resource types will appear (Figure 3). Scroll to the bottom of the list and select WIND (if you prefer, you can type WIND in the text field). Once WIND is selected (or typed) click the OK button. A WIND icon will be added to the PICTWindow.Π.rsrc main window, showing you that a WIND resource exists. A WIND picker window will appear, listing all the WIND resources in this file. Finally, on top of the other two, a WIND editing window will appear, allowing you to edit your new WIND.

Figure 3. Creating a new WIND resource.

By default, your new WIND resource is given the resource ID 128. That’s convenient, since that’s the number we wanted it to have. Use the settings shown in Figure 4 to modify your WIND resource. Click the second icon from the left (at the top of the window) and type in the four numbers shown in the lower left corner.

Figure 4. The WIND editing window from WIND 128.

Next, select Set 'WIND' Characteristics... from the WIND menu that appeared along with the WIND editor. Type in an appropriate window title (don’t change any of the other fields) and click the OK button. Congratulations! You’ve just created your first Macintosh resource. Close the WIND editing window and the WIND picker window, leaving the main window for the resource file. A WIND icon should appear in this window.

Let’s add the second resource needed by our program, the PICT resource. Go to the Scrapbook and Copy the picture you pasted in there earlier (if you prefer, Copy one of the pictures that come with the Scrapbook - Don’t copy plain text. Plain text won’t do what we want).

Once your picture is copied, bring the PICTWindow.Π.rsrc window back to the front and select Paste from ResEdit’s Edit menu. A new resource will be created and a PICT icon will appear in the main window verifying this fact. The PICT resource will automatically be given the resource ID 128. Now would be an excellent time to select Save from the File menu. You are done creating resources.

Quit ResEdit by selecting Quit from the File menu.

Creating the PICTWindow Project

Startup THINK C and create a new project in the PICTWindow folder. Name the new project PICTWindow.Π (be sure to spell it exactly this way). When you run a project, THINK C automatically tacks on the five characters “.rsrc” to the end of the project name and looks for a resource file with that name. If a resource file with that name is found, the resources in that file are automatically made available to your program. PICTWindow.Π is the name of your project file and PICTWindow.Π.rsrc is the name of your resource file.

Once the project is created, go into the Mac Libraries folder and add MacTraps to the project. Next, select New from the File menu to create a new source code file. Type in this source code:

/* 3 */

#define kBaseResID 128
#define kMoveToFront (WindowPtr)-1L


/***************/
/*  Functions  */
/***************/

void  ToolBoxInit( void );
void  WindowInit( void );
void  DrawMyPicture( void );


/****************** main ***************************/

void  main( void )
{
 ToolBoxInit();
 WindowInit();
 
 DrawMyPicture();
 
 while ( !Button() ) ;
}


/****************** ToolBoxInit *********************/

void  ToolBoxInit( void )
{
 InitGraf( &thePort );
 InitFonts();
 InitWindows();
 InitMenus();
 TEInit();
 InitDialogs( nil );
 InitCursor();
}


/****************** WindowInit ***********************/

void  WindowInit( void )
{
 WindowPtrwindow;
 
 window = GetNewWindow( kBaseResID, nil, kMoveToFront );
 
 if ( window == nil )
 {
 SysBeep( 10 );  /*  Couldn't load the WIND resource!!!  */
 ExitToShell();
 }
 
 ShowWindow( window );
 SetPort( window );
}


/****************** DrawMyPicture ********************/

void  DrawMyPicture( void )
{
 Rect   pictureRect;
 PicHandlepicture;
 
 picture = GetPicture( kBaseResID );
 
 if ( picture == nil )
 {
 SysBeep( 10 );  /*  Couldn't load the PICT resource!!!  */
 ExitToShell();
 }
 
 pictureRect = (**picture).picFrame;
 
 OffsetRect( &pictureRect, - pictureRect.left,
 - pictureRect.top );
 
 DrawPicture( picture, &pictureRect );
 
 FrameRect( &pictureRect );
}

Once your source code is typed in, select Save from the File menu. Save the file under the name “PICTWindow.c”. Next, add the source file to the project by select Add (not Add...) from the Source menu. Your project window should look like the one shown in Figure 5.

Figure 5. The project window for PICTWindow.Π.

Running the Program

Now you’re ready to run your program. Select Run from the Project menu. If you encounter any errors, check your source code for typos and make sure your project window has the two files shown in Figure 5. Once your program runs, you should see a window similar to the one shown in Figure 6.

Notice that the picture is drawn in the upper left corner of the window. The upper left corner of the picture is at (0,0) in the window’s local coordinate system.

Figure 6. The PICTWindow window!

Key Lines of Code

Most of the program should make sense to you if you read through last month’s TextBoxer example. Rather than repeat last weeks explanations, I’d like to point out three key segments of code. The first is the code that loads the WIND resource and creates a new window:

/* 4 */

 window = GetNewWindow( kBaseResID, nil, kMoveToFront );

As mentioned earlier, this line of code accomplishes the same thing as NewWindow(), except that GetNewWindow() gets its information from the WIND resource, instead of its parameter list. GetNewWindow() is described in Volume I of Inside Macintosh, on page 283.

The second key line of code is the line that loads the PICT resource:

/* 5 */

 picture = GetPicture( kBaseResID );

This line of code loads the PICT resource with an ID matching kBaseResID. Match this line of code up with the following:

/* 6 */

 DrawPicture( picture, &pictureRect );

and you can really see the power of resources. Two lines of code and you’ve drawn a complex graphic in a window!!! By the way, GetPicture() is on page 475 of Volume I of Inside Macintosh and DrawPicture() is on page 190 of Volume I.

Till Next Month

Take some time to play around with ResEdit. Use ResEdit to modify your WIND resource, changing the type of window (click on the icons on the top row of the WIND editor) and the window’s location. Notice that the picture is drawn in the upper left of the window, no matter where the window is drawn on the screen. Look up OffsetRect() in Inside Macintosh and try to figure out why the picture is drawn where it is.

Finally, try to write a routine that centers the picture in the window. For a little help with this last exercise, you can check out the ShowPICT program in Volume I of the Mac Primer.

Sorry to cut this column short, but the next time I speak with you all, I should be a proud new poppa! Stay tuned...

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Airmail 3.3.2 - Powerful, minimal email...
Airmail is an mail client with fast performance and intuitive interaction. Support for iCloud, MS Exchange, Gmail, Google Apps, IMAP, POP3, Yahoo!, AOL, Outlook.com, Live.com. Airmail was designed... Read more
Numi 3.15.1 - Menu-bar calculator suppor...
Numi is a calculator that magically combines calculations with text, and allows you to freely share your computations. Numi combines text editor and calculator Support plain English. For example, '5... Read more
Airmail 3.3.2 - Powerful, minimal email...
Airmail is an mail client with fast performance and intuitive interaction. Support for iCloud, MS Exchange, Gmail, Google Apps, IMAP, POP3, Yahoo!, AOL, Outlook.com, Live.com. Airmail was designed... Read more
Numi 3.15.1 - Menu-bar calculator suppor...
Numi is a calculator that magically combines calculations with text, and allows you to freely share your computations. Numi combines text editor and calculator Support plain English. For example, '5... Read more
TextSoap 8.4.1 - Automate tedious text d...
TextSoap can automatically remove unwanted characters, fix up messed up carriage returns, and do pretty much anything else that we can think of to text. Save time and effort. Be more productive. Stop... Read more
TextSoap 8.4.1 - Automate tedious text d...
TextSoap can automatically remove unwanted characters, fix up messed up carriage returns, and do pretty much anything else that we can think of to text. Save time and effort. Be more productive. Stop... Read more
Backblaze 4.3.0.44 - Online backup servi...
Backblaze is an online backup service designed from the ground-up for the Mac. With unlimited storage available for $5 per month, as well as a free 15-day trial, peace of mind is within reach with... Read more
Numi 3.15 - Menu-bar calculator supports...
Numi is a calculator that magically combines calculations with text, and allows you to freely share your computations. Numi combines text editor and calculator Support plain English. For example, '5... Read more
EtreCheck 3.3.3 - For troubleshooting yo...
EtreCheck is an app that displays the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to... Read more
BusyContacts 1.1.8 - Fast, efficient con...
BusyContacts is a contact manager for OS X that makes creating, finding, and managing contacts faster and more efficient. It brings to contact management the same power, flexibility, and sharing... Read more

Latest Forum Discussions

See All

The best new games we played this week
We were quite busy this week. A bunch of big mobile games launched over the past few days, alongside a few teeny surprises. There're lots of quality games to load your phone with. We've gone and picked out five of our favorites for the week. [... | Read more »
Magikarp Jump beginner's guide
Magikarp Jump is a mystifying little game. Part Tamagotchi, part idle clicker, there's not a whole lot of video game there, per se, but for some reason we can't help coming back to it again and again. Your goal is to train up a little Magikarp to... | Read more »
Goat Simulator PAYDAY (Games)
Goat Simulator PAYDAY 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: ** IMPORTANT - SUPPORTED DEVICES **iPhone 4S, iPad 2, iPod Touch 5 or better Goat Simulator: Payday is the most... | Read more »
GRID Autosport delayed until autumn
Sorry mobile racing fans -- GRID Autosport has been delayed a few months. The game is now expected to launch this fall on iOS. Feral Interactive announced that they wanted more time to work on the game's UI and overall performance before launching... | Read more »
Zombie Gunship Survival Beginner's...
The much anticipated Zombie Gunship Survival is here. In this latest entry in the Zombie Gunship franchise, you're tasked with supporting ground troops and protecting your base from the zombie horde. There's a lot of rich base building fun, and... | Read more »
Mordheim: Warband Skirmish (Games)
Mordheim: Warband Skirmish 1.2.2 Device: iOS Universal Category: Games Price: $3.99, Version: 1.2.2 (iTunes) Description: Explore the ruins of the City of Mordheim, clash with other scavenging warbands and collect Wyrdstone -... | Read more »
Mordheim: Warband Skirmish brings tablet...
Legendary Games has just launched Mordheim: Warband Skirmish, a new turn-based action game for iOS and Android. | Read more »
Magikarp Jump splashes onto Android worl...
If you're tired ofPokémon GObut still want something to satisfy your mobilePokémon fix,Magikarp Jumpmay just do the trick. It's out now on Android devices the world over. While it looks like a simple arcade jumper, there's quite a bit more to it... | Read more »
Purrfectly charming open-world RPG Cat Q...
Cat Quest, an expansive open-world RPG from former Koei-Tecmo developers, got a new gameplay trailer today. The video showcases the combat and exploration features of this feline-themed RPG. Cat puns abound as you travel across a large map in a... | Read more »
Jaipur: A Card Game of Duels (Games)
Jaipur: A Card Game of Duels 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: ** WARNING: iPad 2, iPad Mini 1 & iPhone 4S are NOT compatible. ** *** Special Launch Price for a limited... | Read more »

Price Scanner via MacPrices.net

Memorial Day savings: 13-inch Touch Bar MacBo...
B&H Photo has the 2016 Apple 13″ Touch Bar MacBook Pros in stock today and on sale for up to $150 off MSRP. Shipping is free, and B&H charges NY & NJ sales tax only: - 13″ 2.9GHz/512GB... Read more
Apple refurbished 13-inch MacBook Airs availa...
Apple has Certified Refurbished 2016 13″ MacBook Airs available starting at $849. An Apple one-year warranty is included with each MacBook, and shipping is free: - 13″ 1.6GHz/8GB/128GB MacBook Air: $... Read more
Apple restocks refurbished 11-inch MacBook Ai...
Apple has Certified Refurbished 11″ MacBook Airs (the latest models recently discontinued by Apple), available for up to $170 off original MSRP. An Apple one-year warranty is included with each... Read more
12-inch 1.2GHz Retina MacBooks on sale for up...
B&H has 12″ 1.2GHz Retina MacBooks on sale for up to $150 off MSRP. Shipping is free, and B&H charges NY & NJ sales tax only: - 12″ 1.2GHz Space Gray Retina MacBook: $1449.99 $150 off... Read more
15-inch 2.7GHz Silver Touch Bar MacBook Pro o...
MacMall has the 15-inch 2.7GHz Silver Touch Bar MacBook Pro (MLW82LL/A) on sale for $2569 as part of their Memorial Day sale. Shipping is free. Their price is $230 off MSRP. Read more
Free Tread Wisely Mobile App Endorsed By Fath...
Just in time for the summer driving season, Cooper Tire & Rubber Company has announced the launch of a new Tread Wisely mobile app. Designed to promote tire and vehicle safety among teens and... Read more
Commercial Notebooks And Detachable Tablets W...
Worldwide shipments of personal computing devices (PCDs), comprised of traditional PCs (a combination of desktop, notebook, and workstations) and tablets (slates and detachables), are forecast to... Read more
Best value this Memorial Day weekend: Touch B...
Apple has Certified Refurbished 2016 15″ and 13″ MacBook Pros available for $230 to $420 off original MSRP. An Apple one-year warranty is included with each model, and shipping is free: - 15″ 2.6GHz... Read more
13-inch MacBook Airs on sale for up to $130 o...
Overstock.com has 13″ MacBook Airs on sale for up to $130 off MSRP including free shipping: - 13″ 1.6GHz/128GB MacBook Air (sku MMGF2LL/A): $869.99 $130 off MSRP - 13″ 1.6GHz/256GB MacBook Air (sku... Read more
2.8GHz Mac mini available for $973 with free...
Adorama has the 2.8GHz Mac mini available for $973, $16 off MSRP, including a free copy of Apple’s 3-Year AppleCare Protection Plan. Shipping is free, and Adorama charges sales tax in NY & NJ... Read more

Jobs Board

*Apple* Retail - Multiple Positions - Apple,...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Media Products - Commerce Engineerin...
Apple Media Products - Commerce Engineering Manager Job Number: 57037480 Santa Clara Valley, California, United States Posted: Apr. 18, 2017 Weekly Hours: 40.00 Job Read more
*Apple* Media Products - Commerce Engineerin...
Apple Media Products - Commerce Engineering Manager Job Number: 57037480 Santa Clara Valley, California, United States Posted: Apr. 18, 2017 Weekly Hours: 40.00 Job Read more
Best Buy *Apple* Computing Master - Best Bu...
**509643BR** **Job Title:** Best Buy Apple Computing Master **Location Number:** 001482- Apple Valley-Store **Job Description:** **What does a Best Buy Apple Read more
*Apple* Media Products - Commerce Engineerin...
Apple Media Products - Commerce Engineering Manager Job Number: 57037480 Santa Clara Valley, California, United States Posted: Apr. 18, 2017 Weekly Hours: 40.00 Job Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.